# 注释
"""
注释
"""
'''
注释
'''

a=1
number=1
Number=1
_number=1
the_number=1
#字母数字下划线，不能以数字开头，关键词不能作为变量名

type(1)
type(1.1)
type('1')
type('hello')
type([123,213])
type(True)
type(None)

a=a+1

a+=1

a*=1

s1='hello'
s2='world'
print(s1+s2)
print(s1*3)

a=10%2

1==1
1!=1


if a%2==0:
    print('偶数')
else:
    print('奇数')

while a<10:
    print(a)
    a+=1
    break
    continue

for i in range(10):
    print(i)
range(5)=[0,1,2,3,4]
for i in [0,1,2,3,4]:
    print(i)

s1='the true'
s1=s1[:]
s=s1.split(' ')
s=' '.join(s)